<template>
  <div>
    <!-- v-model 双向绑定手机的是el-option的value，el-form添加：model绑定到哪 -->
    <el-form :inline="true"  class="demo-form-inline" :model='cForm'>
      <el-form-item label="一级分类" >
        <el-select  placeholder="请选择" v-model='cForm.category1Id' @change='handler1' :disabled='show'>
          <el-option :label='c1.name' :value='c1.id' v-for='c1 in list1' :key='c1.id'></el-option>
        </el-select>
      </el-form-item>
      <el-form-item label="二级分类" >
        <el-select  placeholder="请选择" v-model='cForm.category2Id' @change='handler2' :disabled='show'>
          <el-option :label='c2.name' :value='c2.id' v-for='c2 in list2' :key='c2.id'></el-option>
        </el-select>
      </el-form-item>
      <el-form-item label="三级分类" >
        <el-select  placeholder="请选择" v-model='cForm.category3Id' @change='handler3' :disabled='show'>
          <el-option :label='c3.name' :value='c3.id' v-for='c3 in list3' :key='c3.id'></el-option>
        </el-select>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
export default {
  name: "CategorySelect",
  props: ['show'],
  data () {
    return {
      list1: [],
      list2: [],
      list3: [],
      // 手机相应一二三级id
      cForm: {
        category1Id: '',
        category2Id: '',
        category3Id: ''
      }
    }
  },
  // 组件挂载完毕 发请求 获取一级分类
  mounted () {
    this.getCategory1List ()
  },
  methods: {
    // 获取一级分类方法
    async getCategory1List () {
      let result = await this.$API.attr.reqCategory1List ()
      // console.log(result)
      if (result.code == 200) {
        this.list1 = result.data
      }
    },
    // 一级分类变化时，事件回调
    async handler1 () {
      // 清除数据
      this.list2 = []
      this.list3 = []
      this.cForm.category2Id = ''
      this.cForm.category3Id = ''
      const {category1Id} = this.cForm
      // 触发自定义事件， 传递给父组件id参数
      this.$emit ('getCategoryId', {categoryId:category1Id, level: 1})
      let result = await this.$API.attr.reqCategory2List (category1Id)
      // console.log(result)
      if (result.code == 200) {
        this.list2 = result.data
      }
    },
    // 二级分类变化事件回调
    async handler2 () {
      // 清除数据
      this.list3 = []
      this.cForm.category3Id = ''
      const {category2Id} = this.cForm
       // 触发自定义事件， 传递给父组件id参数
      this.$emit ('getCategoryId', {categoryId:category2Id, level: 2})
      let result = await this.$API.attr.reqCategory3List (category2Id)
      // console.log(result)
      if (result.code == 200) {
        this.list3 = result.data
      }
    },
    // 三级分类变化事件回调
    handler3 () {
      const {category3Id} = this.cForm
       // 触发自定义事件， 传递给父组件id参数
      this.$emit ('getCategoryId', {categoryId:category3Id, level: 3})
    }
  }
}
</script>

<style  scoped>
</style>
